ANALYSIS OF LATERALLY LOADED PILES USING FINITE ELEMENT MODEL

ANALYSIS OF LATERALLY LOADED PILES USING FINITE ELEMENT MODEL

Submitted byR.RAVICHANDRANUnder the guidance ofMALA.M.E., HOD

The behaviour of a laterally loaded pile in homogeneous soil layer analysed was by Finite Element Method. First the analysis was carried out for a pile in only soft clay with Es value of 3000 KN/m2 and cohesion less soil of Es value 54000 KN/m2. A concrete pile of 600mm diameter and 22 m long was considered for the analysis. Concrete mix adopted for the pile is M40. Horizontal load was applied at the head. The top deflection and maximum moment tabulated and compared from the following Tables ANALYSIS OF SINGLE PILE Homogeneous Soil Layer

TABLE-1 PROPERTIES OF THE MATERIALSPile Diameter (D)500mmLength of Pile (L)17mYoungs modulus of Pile(Ec)36051080 KN/m2Poissions ratio()0.15Youngs modulus of Soil (Es)3000 & 54000 KN/m2

Figure 1 Finite Element Model for cohesive soil

Figure. 2 Finite Element Model for cohesive less soilTable .5 Pile top deflection for various loads

Load Deflection curve

Maximum Moment for 200KNThe behaviour of a laterally loaded pile in two layered soil was analysed by Finite Element Method. First the analysis was carried out for a pile in only soft clay with Es value of 3000 KN/m2 and cohesion less soil of Es value 54000 KN/m2 of the top 20 cm was varied and the same analysis was carried out. The thickness of top layer was again varied from 20 cm, 40 cm, 80 cm, 100 cm and 200 cm. ANALYSIS OF PILE IN A TWO LAYER SYSTEM

Table .4 Properties of the materials Two-Pile GroupPile Diameter (D)1000mmLength of Pile (L)12mYoungs modulus of Pile(Ec)36051080 KN/m2Poissions ratio()0.15Youngs modulus of Soil (Es)3000 & 54000 KN/m2

ANALYSIS OF PILE GROUPSThe two pile groups each consisting of two or three piles are considered. Further, different configurations (series and parallel arrangement of piles in the group) are considered for each pile group. In each case, the spacing between the piles is varied from 2D to 5D. Further, the piles are connected at their pile caps of concrete. The pile group is considered to have been embedded in the cohesive soil. Figure 7Pile Group arrangement

Table 7 Properties of the materials for Two-pile groupPile Diameter (D)300mmLength of Pile (L)10mYoungs modulus of Pile(Ec)36051080 KN/m2Poissions ratio()0.15Youngs modulus of Soil (Es)5000 KN/m2

Figure.8Finite Element Model for Two- Pile group parallel configuration

Figure.9Finite Element Model for Two- Pile group series configurationTop Deflection Two piles group in mm 2D ,3D,4D,5DTable 9 Two piles group Moment for load of 1000KNFigure .9 Load Deflection curve Two- Pile Group

Table 8Two Piles group top deflection for various loads

Figure. 10 Maximum Moment curve for Two- Pile Group

Figure.11Finite Element Model for Three- Pile group parallel configuration

Figure.12Finite Element Model for Three- Pile group series configurationThe results and discussion and the comparison based on the tables indicates that the maximum reduction of displacement of the pile top in series configuration will be discussed in the next review.